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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

STMicroelectronics L78S75CV-DG

Name: L78S75CV-DG
Brand: STMicroelectronics
SKU: L78S75CV-DG
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: L78S75CV-DG

Manufacturer:: STMicroelectronics

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-220-3

Datasheet:: L78S75CV-DG.pdf

Description:: IC REG LINEAR 7.5V 2A TO220

Quantity:: RFQ Add To RFQ list

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Product details

Overview

L78S75CV-DG from STMicroelectronics is a fixed-output +7.5 V, 2 A positive linear voltage regulator in TO-220 package, featuring internal current limiting, thermal shutdown, and safe operating area (SOA) protection. It delivers stable local regulation for industrial power supplies, motor control logic rails, and embedded system auxiliary voltages with ≤140 mV load regulation (20 mA–1.5 A) and 48 dB supply voltage rejection at 120 Hz.

For engineers reviewing the L78S75CV-DG datasheet, L78S75CV-DG pinout, L78S75CV-DG application, or L78S75CV-DG equivalent, key selection criteria include dropout behavior under 2 A load, thermal resistance (5 °C/W junction-to-case), output noise (52 µV RMS, 10 Hz–100 kHz), and compatibility with standard TO-220 heatsinks in high-reliability 24 V input systems.

Technical Context

The L78S75CV-DG implements a monolithic series pass transistor architecture with built-in foldback current limiting and thermal foldback to sustain operation during overload or elevated ambient temperatures. Its SOA protection prevents secondary breakdown during transient overloads up to 3 A peak short-circuit current.

Designed for fixed-voltage operation, it supports external configuration for adjustable outputs, constant-current regulation, and remote shutdown via the input pin. Input voltage range is 10.5 V to 25 V for ≤1 A loads, with guaranteed stability without output capacitance-though a capacitor improves transient response.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	7.5 V ±0.35 V (min/max at 25 °C, 500 mA); maintains regulation across 0–70 °C junction range with −0.8 mV/°C drift
Max Output Current	2 A continuous; internally limited with peak short-circuit current of 3 A for transient survival
Line Regulation	60 mV max over VI = 10.5–20 V; ensures stable output despite input ripple or supply sag in 24 V bus systems
Load Regulation	100 mV max from 20 mA to 2 A; critical for consistent logic-level rail integrity under dynamic load switching
Supply Rejection	48 dB at 120 Hz; suppresses AC line harmonics and switching noise from upstream converters
Output Noise	52 µV RMS (10 Hz–100 kHz); low enough for analog sensor biasing and precision reference buffering
Thermal Resistance	5 °C/W junction-to-case; enables ≥2 A delivery with standard TO-220 heatsink (e.g., 10 °C/W sink yields ~75 °C rise at full load)

Pinout & Package

TO-220 package (dual-gauge lead frame) with vertical mounting orientation, integrated heat slug on backside, and 3-pin through-hole configuration requiring mechanical anchoring and thermal interface to heatsink.

Pin/Terminal	Circuit Role	Design Meaning
Input (Pin 1)	Unregulated DC supply input	Accepts 10.5–25 V DC; must be decoupled locally to limit input impedance and prevent oscillation during transients
Ground (Pin 2)	Reference and return path	Common node for input capacitor, output capacitor, and load return; routing must minimize inductance to preserve PSRR
Output (Pin 3)	Regulated +7.5 V source	Delivers up to 2 A; requires ≥10 µF low-ESR electrolytic or ceramic capacitor for stability and transient immunity

Key Features

Feature	Design Value
Thermal shutdown	Activates at ~150 °C junction temperature, latching off until cooldown-prevents permanent damage during sustained overload
Short-circuit protection	Foldback current limiting reduces output current to ~500 mA during hard shorts, limiting power dissipation to safe levels
SOA protection	Monitors V_CE × I_C in real time to avoid second breakdown during high-V_IN/low-V_OUT operation (e.g., 24 V in → 7.5 V out @ 2 A)
No external compensation	Internally compensated for unity-gain stability with ≥10 µF output capacitance-eliminates design iteration for phase margin
Wide input range support	Operates from 10.5 V (min for 1 A) to 25 V (max for line regulation test), enabling use behind rectified 18 V AC or 24 V DC supplies

Applications

Industrial PLC I/O Module Power

Motor Driver Logic Supply

Use Scenario: Powers isolated digital input conditioning circuits and relay driver logic in DIN-rail mounted programmable logic controllers.

IC Role / Device Role / Timing Role: Local +7.5 V rail generator delivering clean, regulated voltage to optocoupler LEDs and microcontroller GPIOs.

Use Value: Maintains 7.5 V ±3% across 20 mA–1.8 A load steps with <100 µs recovery-ensuring deterministic state transitions during fast I/O scanning.

Use Scenario: Supplies gate drivers and current-sense amplifiers in 3-phase BLDC motor inverters with 24 V bus input.

IC Role / Device Role / Timing Role: Dedicated logic rail regulator decoupled from noisy power stage, rejecting PWM-induced supply ripple.

Use Value: 48 dB SVR at 120 Hz and 52 µV noise enable accurate 12-bit ADC sampling of shunt-based current feedback signals.

Embedded System Auxiliary Rail

Test Equipment Bias Supply

Use Scenario: Generates +7.5 V for FPGA configuration memory, USB PHY termination, and clock buffer ICs in compact edge devices.

IC Role / Device Role / Timing Role: On-board point-of-load regulator replacing inefficient buck converter for low-noise, low-cost subsystem power.

Use Value: TO-220 thermal performance allows 2 A delivery with passive heatsinking-reducing BOM count vs. switching solution while meeting EMI limits.

Use Scenario: Provides stable excitation voltage for precision resistive sensor bridges and calibration references in benchtop multimeters.

IC Role / Device Role / Timing Role: Low-drift, low-noise reference rail supporting ratiometric measurements independent of main supply variations.

Use Value: −0.8 mV/°C tempco and 52 µV noise ensure <0.01% measurement uncertainty over 0–50 °C ambient operating range.

Equivalent & Alternatives

The following parts are listed as comparable options for similar fixed-output linear regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM78H75K STEEL	Same 7.5 V output and TO-3 package; higher thermal resistance (8 °C/W) and lower max current (1.5 A)	Requires larger heatsink for 2 A operation; less suitable for space-constrained PCBs	Prefer when legacy TO-3 footprint compatibility is mandatory and thermal budget allows derating
TL78L75ACDR	7.5 V output but only 100 mA rated; SOT-89 package; no SOA or thermal shutdown	Cannot replace L78S75CV-DG in >100 mA loads; lacks fault protection for industrial environments	Select only for ultra-low-power auxiliary rails where size and cost outweigh robustness requirements

Compared with LM78H75K STEEL and TL78L75ACDR, the L78S75CV-DG uniquely combines 2 A capability, SOA protection, and TO-220 thermal efficiency-making it the sole choice for ruggedized 7.5 V regulation where fault resilience and power density are co-prioritized.

Availability

L78S75CV-DG is available at Aetrix Electronics and suitable for industrial PLCs, motor control systems, embedded instrumentation, and test equipment requiring stable component supply with full production lifecycle support.

Supply support for L78S75CV-DG includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing silicon solutions for automotive, industrial, and power management applications.

The L78S series belongs to ST's legacy linear regulator product line, engineered specifically for high-reliability, fixed-output local regulation in harsh industrial environments where simplicity, fault tolerance, and thermal robustness are essential.

FAQ

What is the minimum input voltage required for full 2 A output at 7.5 V?

The L78S75CV-DG requires a minimum input voltage of 10.5 V to sustain 1 A output; for 2 A, the datasheet specifies VI ≥ 12.5 V under typical conditions. Dropout voltage rises with load and temperature-measured at ~2.5 V at 2 A and 25 °C-so 15 V input is recommended for margin in thermally constrained designs.

Can this regulator be used in adjustable-output configurations?

Yes-the L78S75CV-DG can be configured as an adjustable regulator using external resistors and a Zener diode per Figure 19 in the datasheet, enabling outputs from 7 V to 30 V. However, the internal 7.5 V reference remains active; adjustment modifies the feedback network, not the core regulation mechanism.

Is an input capacitor required for stable operation?

An input capacitor is not strictly required for stability due to internal compensation, but ST recommends ≥0.33 µF ceramic near the input pin to suppress high-frequency noise and prevent oscillation when the regulator is located more than 6 inches from the bulk filter capacitor-especially in noisy 24 V DC systems.

How does thermal protection behave during sustained overload?

Thermal shutdown activates at ~150 °C junction temperature, halting output until junction cools to ~135 °C. Unlike simple trip-and-hold, the L78S series uses hysteresis and gradual foldback-allowing brief 2 A surges even at elevated ambient, then reducing current progressively before full shutdown to avoid thermal cycling stress.

L78S75CV-DG Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Series:: -

Package/Case:: TO-220-3

Packaging:: Tube

Product Status:: Obsolete

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 35V

Voltage - Output (Min/Fixed):: 7.5V

Voltage - Output (Max):: -

Voltage Dropout (Max):: -

Current - Output:: 2A

Current - Quiescent (Iq):: 8 mA

Current - Supply (Max):: -

PSRR:: 48dB (120Hz)

Control Features:: -

Protection Features:: Over Current, Over Temperature, Short Circuit

Operating Temperature:: 0°C ~ 150°C

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: TO-220

L78S75CV-DG FAQ

1.How can I place an order for L78S75CV-DG through Aetrix?

Please submit a Request for Quotation (RFQ) for L78S75CV-DG on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for L78S75CV-DG reliable?

The price and inventory of L78S75CV-DG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for L78S75CV-DG is usually 5 days.

3.What payment methods are accepted for L78S75CV-DG?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for L78S75CV-DG transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for L78S75CV-DG?

L78S75CV-DG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your L78S75CV-DG order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for L78S75CV-DG?

For technical support, including L78S75CV-DG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your L78S75CV-DG requirements.

6.How does Aetrix verify that L78S75CV-DG is sourced from the original manufacturer or authorized distributors?

All L78S75CV-DG products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that L78S75CV-DG meets industry standards.

7.What is the process for return or replacement of L78S75CV-DG?

All L78S75CV-DG units undergo pre-shipment inspection (PSI). If there is an issue with L78S75CV-DG, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The L78S75CV-DG part is unused and in its original packaging.

Return procedure for L78S75CV-DG:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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